When water temperatures are hovering near 45 degrees, a perfect storm for what is called "Cold Water Immersion." When you first go into extremely cold water there is a response called “cold shock response.” You will start to hyperventilate immediately. For one to three minutes, you breathe very fast and deep, uncontrollably. If you go underwater, you could easily swallow water and die. This is the likely cause of many, if not most, cold water drownings. Once that response goes away, you're fine…for a little while. According to Scientific American, a person can survive in 41-degree (Fahrenheit) water for about 15 minutes before the muscles get weak. You will lose coordination and strength as the blood moves away from the extremities and toward the core, of the body. Wearing an approved PFD is always wise but in the winter everyone on the water should consider it mandatory, please!
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